Specifications

18 Network Processing Engine Replacement Instructions

Installation Prerequisites

Caution Make sure to tighten the captive installation screws on the network processing engine,

Cisco uBR7200 series cable modem cards, and the I/O controller (use a number 2 Phillips or a

3/16-inch ﬂat-blade screwdriver). These screws prevent accidental removal, provide proper

grounding for the router, and help to ensure that the network processing engine, Cisco uBR7200

series cable modem cards, and the I/O controller are properly seated in the router midplane.

Following are guidelines for preventing ESD damage:

• Always use an ESD wrist strap or ankle strap when installing or replacing the network processing

engine, I/O controller, port adapters, or Cisco uBR7200 series cable modem cards. Ensure that

the ESD strap makes contact with your skin.

• Handle the network processing engine, I/O controller, port adapters, or Cisco uBR7200 series

cable modem cards by their metal carrier edges and handles only; avoid touching the printed

circuit board components or any connector pins.

• When removing the network processing engine, I/O controller, port adapters, or Cisco uBR7200

series cable modem cards, place them on an antistatic surface with the printed circuit board

components facing upward, or in a static shielding bag. If you are returning an I/O controller,

network processing engine, port adapter, or Cisco uBR7200 series cable modem card to the

factory, immediately place it in a static shielding bag.

Caution Periodically check the resistance value of the antistatic strap. The measurement should be

within the range of 1 and 10 megohms.

Ensuring Easy Access to the Router

If your Cisco 7200 series router or Cisco uBR7200 series router is installed in a standard 19-inch,

4-post or telco rack, cables from other equipment in the rack might obstruct access to the rear of the

router. Also, rack power strips or other permanent ﬁxtures may obstruct access to the router. Review

the following guidelines to ensure easy access to the rear of the router when it is installed in a rack.

If the router is not installed in a rack, or if you already have clear access to the rear of the router,

proceed to the “Removing and Replacing the Network Processing Engine” section on page 19.

Use the following guidelines to ensure easy access to the rear of the router when it is installed in a

rack:

• Ensure that you have at least 3 to 4 feet of working space at the rear of the router.

• If cables from other equipment in the rack fall in front of the rear end of the router, carefully

gather the cables (using care not to strain them) and use cable ties to anchor them away from the

rear of the router.

• If access to the rear of the router is partially blocked by a power strip or some other permanent

rack ﬁxture, detach the router from the rack and carefully slide it forward until there is enough

clearance to remove the power supply, the network processing engine, and the subchassis from

the router. Detailed steps for detaching the router from the rack are contained in the “Removing

and Replacing the Network Processing Engine” section on page 19.

Caution Make sure that at least one other person is available to support the front of the router as

you slide it out from the rack and, if necessary, to continue to support it while you remove and insert

the power supply, network processing engine, or subchassis.